7 20 



INDEX. 



Termites defcribed, 292. :; 



Timber, organization of, 652. 



Thrips phyfapus defcribed, 387. 



Tubularia, a fpecies of polype defcribed, 449. 



V 



Vifion, the nature of, 28 ; in the eye, 3 1 . 

 Vegetables, manner of preparing, 157. 

 Vorticellae, many fpecies of defcribed, 433. 

 Veflels between the bark and rind of trees, 659 ; fap, 674 ; in- 

 raoft, 675. 



W 



Water, globules of, ufed as microfcopes by Mr. Gray, 13 ; two 

 drops of, 14. 



Wilfon's pocket microfcope defcribed, 103; improved by a 

 fcrole, 106. 



Withering, Dr. his botanical microfcope, 115. 

 Wafp, the mafon ichneumon, 286. 



Wings of infeas, 367 ; of the moth and butterfly, 370 ; motion 

 of ditto, 372 ; of the hemerobius perla, 373 ; of the earwig, 

 374. 



Wood confidered, 668. 



A Cata- 



